wtfpython

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The example

from typing import Optional


class S:
    pass


class A:
    S: Optional[S] = S()

    pass


if __name__ == '__main__':
    print("ok?")

TypeError: Optional[t] requires a single type.

https://repl.it/repls/LikableCommonRobodoc

I believe there is a namespace clash between the class variables and the types.